基于SDN网络感知自动分配带宽框架的设计与实现

发布时间：2018-01-07 10:30

本文关键词：基于SDN网络感知自动分配带宽框架的设计与实现　出处：《内蒙古大学》2017年硕士论文　论文类型：学位论文

【摘要】：随着互联网应用技术的迅猛发展,人们对于网络的依赖度越来越高,各种新应用对网络带宽的要求也越来越高,但是当前网络带宽资源价格非常昂贵,如何在有限的带宽资源中合理的利用带宽,提高其利用率就成为一个必须面对的问题。SDN(Software Defined Network)将控制和转发进行分离,通过SDN的集中式控制,使得SDN的控制器能够获取整个网络拓扑,网络管理者就可以合理的利用获得的信息来调动网络资源,进一步地优化网络资源的使用,从而提高网络带宽的利用率。SLA(Service Level Agreements)是提供商和用户协商而确定的关于服务质量等级的协议或合同。随着更多的商业应用在Internet中广泛开展,越来越需要SLA对性能(如响应时间等)进行保障,并且这种需求随着越来越多的商业服务行为在Internet中变得更加重要。但是SLA描述的是服务提供商与用户之间的协议,属于高层策略,无法将其直接发给SDN控制器,即SDN控制器无法接收SLA的需求,所以使得SDN控制器不能直接接收用户的需求并实现需求到资源的自动分配。本文提出的网络感知的自动分配带宽框架,主要分为三个模块:(1)用户需求模块:本文首先用CNL(Controlled Natural Language)描述SLA,并从SLA中获取QoS等级需求,按照CNL格式,用YANG对SLA的用户需求进行建模,实现了 SLA描述的用户需求自动转为YANG的输入,使得Opendaylight控制器能够识别SLA用户需求。(2)网络感知模块:通过控制器中Topologymanager模块、Statisticsmanager模块中的方法对底层流量信息进行监测,通过监测到的信息,计算出当前网络的带宽、时延和丢包率。(3)带宽分配模块:本文根据用户需求模块获取到的用户需求和网络感知模块采集到的信息,通过多QoS约束的算法实现满足用户需求的路径,从而有效的利用带宽资源,提高用户满意度。
[Abstract]:With the rapid development of Internet application technology, people rely more and more on the network, and all kinds of new applications require the network bandwidth more and more, but the current network bandwidth resources are very expensive. How to use bandwidth reasonably in limited bandwidth resources. Increasing its utilization becomes a problem that must be faced. SDNN Software Defined Network separates control from forwarding. Through the centralized control of SDN, the controller of SDN can obtain the whole network topology, and the network manager can use the information to mobilize the network resources. Further optimize the use of network resources. To improve the utilization of network bandwidth. SLA-Service Level agreements). It is a negotiated agreement or contract between the provider and the user on the quality of service level. As more commercial applications become available in Internet. There is a growing need for SLA to guarantee performance (such as response time). And this requirement becomes more and more important in Internet with more and more business service behavior, but SLA describes the protocol between service provider and user, which is a high-level policy. It cannot be sent directly to the SDN controller, that is, the SDN controller cannot receive the requirements of the SLA. Therefore, the SDN controller can not directly receive the user's needs and realize the automatic allocation of resources. This paper proposes a network-aware automatic bandwidth allocation framework. It is divided into three modules: (1) user requirement module: this paper uses CNL(Controlled Natural language to describe SLA. The QoS level requirement is obtained from SLA. According to the CNL format, the user requirement of SLA is modeled with YANG, and the user requirement described by SLA is automatically transformed into YANG input. Enables the Opendaylight controller to identify the SLA user needs. 2) the network awareness module: through the Topologymanager module in the controller. The method in the Statisticsmanager module monitors the bottom flow information and calculates the bandwidth of the current network through the monitoring information. Delay and packet loss rate. 3) bandwidth allocation module: this paper according to the user requirements module acquired by the user requirements and network awareness module to collect information. The path to meet the needs of users is realized by the algorithm with multiple QoS constraints, so that the bandwidth resources can be utilized effectively and the user satisfaction can be improved.
【学位授予单位】：内蒙古大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TP393.0

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